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An ecoregion (ecological region) is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than a biogeographic realm. Ecoregions cover relatively large areas of land or water, and contain characteristic, geographically distinct assemblages of natural communities and species .
2 Puget Lowland. 3 Willamette Valley. 111 Ahklun Mountains and Kilbuck Mountains. 113 Alaska Peninsula Mountains. 115 Cook Inlet. 119 Pacific Coastal Mountains. 120 Coastal Western Hemlock-Sitka Spruce Forests. The corresponding CEC ecoregion in Canada is called the Pacific Maritime Ecozone.
Ecoregions of North America, featuring the 50 United States, the District of Columbia and the 5 inhabited territories. The following is a list of ecoregions in the United States as identified by the World Wide Fund for Nature (WWF).
Each ecoregion is classified into one of 14 major habitat types, or biomes. In 2017 the WWF team revised ecosystem names and boundaries in the Arabian Peninsula, drier African regions, and Southeastern United States. [1]
The Global 200 is the list of ecoregions identified by the World Wide Fund for Nature (), the global conservation organization, as priorities for conservation.According to WWF, an ecoregion is defined as a "relatively large unit of land or water containing a characteristic set of natural communities that share a large majority of their species dynamics, and environmental conditions".
The classification system has four levels. Only the first three levels are shown on this list. "Level I" divides North America into 15 broad ecoregions. "Level II" subdivides the continent into 52 smaller ecoregions. "Level III" subdivides those regions again into 182 ecoregions. [1][2] "Level IV" is a further subdivision of Level III ecoregions.
The low desert of southeastern California is part of the Sonoran desert ecoregion, which extends into Arizona and parts of northern Mexico. [2] California has two high deserts: the Mojave desert and the Great Basin Desert. The Mojave desert ecoregion is marked by the presence of Joshua trees. [3] The dry cold Great Basin desert of California ...
Global 200 ecoregions (WWF), 238 single or combined ecoregions identified by the World Wildlife Fund (WWF) as priorities for conservation. List of terrestrial ecoregions (WWF) 867 terrestrial ecoregions. List of marine ecoregions (WWF), 232 marine ecoregions of the coastal and continental shelf areas. List of freshwater ecoregions (WWF), 426 ...